By J. P. Cox
Stories in pulsating stars that owe their variability to periodic growth and contraction.
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The first volume covers topics you cannot find in other standard texts in stellar astrophysics. It is now out of print. , II 1978, The Virial Theorem in Stellar Astrophysics (Tucson: Pachart) contains many applications and variations on the virial theorem plus detailed derivations. Our discussion of the theorem does not include important topics such as magnetic fields, rotation, and relativistic effects. You will find them in Collins. The references to Cox (1968) and Clayton (1968) are listed above.
We shall not discuss here precisely what kinds of thermonuclear burning take place in stars (see Chap. 6) but we shall extend our notion of equilibrium to include energy generation and how it is balanced by the leakage of energy through the star. In particular, suppose some sort of nuclear burning is taking place within a given localized gram of material. If the energy generated in that gram is not transferred elsewhere, then a nonequilibrium condition holds and the material heats up. ) The sample of material is, of course, not strictly in equilibrium because, in the case of fusion, the composition is changing with time as more massive nuclear species are produced—but usually very slowly.
6) but we shall extend our notion of equilibrium to include energy generation and how it is balanced by the leakage of energy through the star. In particular, suppose some sort of nuclear burning is taking place within a given localized gram of material. If the energy generated in that gram is not transferred elsewhere, then a nonequilibrium condition holds and the material heats up. ) The sample of material is, of course, not strictly in equilibrium because, in the case of fusion, the composition is changing with time as more massive nuclear species are produced—but usually very slowly.
